Improvement in steam-generators



"NITED STATES WILLIAM P; TnowBRIDeE, 0E NEW HAvEitooNNEoTIoUT.

IMPROVEMENT IN STEAM-GENERATORS,

Specilication forming part of Letters Patent No. 142,534, datedSeptember 2, 1873; application filed March 26,1873.

To all 'whom t may concern:

tutes a part of this specification, and repre sents a verticalsection.

This invention relates to an improvement in apparatus for generatingsteam or evaporating purposes by means of a medium passing through acoil or succession of pipes within a boiler or evaporating chamber.

It is a Well-known fact that water or other` medium entering a heatedvessel below,pass ing therethrough, will, as it becomes heated, passVoutat the upper portion, thence to any desired point or vessel,returning through the lower tube to be again reheated, and socontinuing, the circulation of' the fluid `causing the heating of thatportion outside that immediately in contact with the re. For evaporatingpurposes a succession of pipes or coils are sometimes arranged in thebottom of an evaporating pan orchamber, these pipes having connectionswith other coils or chamber inor around the lire-box, so that one end ofA thetube will lead into the lower portion and the other end into theupper portion. When heatedthe circulation will be maintained, as beforedescribed, heating the pipes in the evaporating chamber or pan to causethe heating or evaporating of the contents; but in such construction, inproportion as the tubes outside or away from the re become` heated, therapidity of the circulation diminishes-that is, if the Iiuid or mediumin the tube outside the fire-box is of the same temperature as thatwhere lthe heat is applied,

there will be no circulation; hence such av chamber in connection with asecond coil orn succession of pipes leading from the upper p portion ofthe irst and returning into .the lower portion of the first, combinedwith a pump in connection with or between the said heating chamber orcoil and the second coil, whereby a forced circulation of the liquidfrom the first chamber through a circuit embracing the secondlcoil ismaintained through both, and not dependent upon the evaporation in thefirst or condensation in the second, as more fully hereinafterdescribed.

I illustrate my invention as for generating steam within a close boiler.

A is a lire-box of any convenient construction; B, theY outlet for theproducts of combustion. Within the fire-box a coil, G, ofV tubing isarranged, one end extending ont below, as at a, the other above, as atd. From thepoint a a tube, D, leads to a pump, E, of any/suitableconstruction for forcing the fluid. From the pump, in the oppositedirection, the pipe E', which is practically a continuation of the pipeD, leads into a boiler, F, at or near the bottom. Within the boiler thepipe is coiled, passing out near the top, as at b, thence running intoconnection with the lire-box coil, as at d. At any convenient point astandpipe,H, is arranged in connection with the said tube extendingabove the highest point.

Through this stand-pipe H `the tube is filled, but not so as tocompletely fill the stand-pipe. The stand pipe is then closed, the spacewithin allowing the expansion o emedium within the tube when heated.This pipe may be closed by a regulated pressure, if desirable! Theboiler F is preferably made from strong cast metal, so as to be capableof standing a very great pressure, and from this an outlet, L, permitsthe taking of the steam from the boiler to any desired. point. Theboiler is partly lled with water or iiuid from which it is desired togenerate steam, say, up to the broken lines. `This completesthe'apparatus. The fire made within the fire-box rapidly heats the coilG. The pump E is started and kept in motion, drawing the water from thecoil in the boiler and forcing it through the coil in the nre-box backinto the boiler, thus maintaining a rapid circulation within the tube,and this, as rapidly heated within the tire-box, u

P coil to a high degree; thence to be taken to pss ng to the boilerquick y causes the boilin g of water therein, gener ating steam there-"i m, which rapidly rises through the upper rt on of the coil; thereslperheated by the the point of utilization.

By this construction I am en abled to generate a large amount of veryhigh pressure steam Within a compass very s all when compared to othersteamgenerati f apparatus of equal capacity, and such a steani-generating apparatus is peculiarly adapt ad for steam-engines forlight work, which is now done by foot or hand for want of a competentpower oi' little cost.

In such class of apparatus the firing or principal heating may be doneby the use of gas or equivalent means, so that when a constant use isnot required, the getting up oi Water may be used as the medium tocirculate in the pipes, but for very high temperature some other mediumwhich does not boil until a much higher temperature would be preferable.

I claim as my invention- In an apparatus for generating steam orevaporating, consisting of a coil or succession of connected pipes, or achamber, arranged so that heat may be applied thereto, the said coil orchamber in connection with a second coil or succession of pipes leadingfrom the upper portion of the first and returning into the lower portionof the iirst, a pump, E, in connection With or between the saidheatingchamber or coil and the second coil, whereby a forced circulationof the liquid from the first chamber through a circuit embracing the second coil is maintained through both, and not dependent upon theevaporation in. the irst or condensation in the second, substantially asand for thev purpose described.

WILLIAM P. 'IR'Oifi/'BRIDGE` Witnesses A. J'. Tnx'ul'rs, J. C. EARLE.

